Sorry to be posting so much but I'm trying to figure this out :-[
I just did a controlled test. I made my sketch do the following:
- set servo to position 78 (just so happens to the position I want it aimed in)
then loop:
- enable motor one at 1/2 power
- delay for 3 seconds
- turn motor one off
As expected, when the motor turns on the servo get's jumpy and heads hard left. When the motor turns off the servo returns to the proper position. Using a multimeter on the servo's signal wire I see that the voltage when the motor is off is a solid 0.34V yet when the motor engages it drops to 0.33V.
I also tried the same test with the motor running full power and I see the same 0.01V drop on the servo signal pin. Does this point to anything obvious?